Oi (BSP:OIBR4) E10: R$1,863.56 (As of Jun. 2025)


BSP:OIBR4 Oi SA BSP:OIBR4
28 GF Score
Price R$0.84
GF Value R$14.28
Valuation Possible Value Trap
! 6 Warning Signs
View Full Analysis

What is Oi E10?

Oi BSP:OIBR4 -5.62% 28 E10 is R$1,863.56 as of Jun. 2025. GuruFocus rates BSP:OIBR4 with a GF Score™ of 28/100 and a GF Value™ of R$14.28 (Possible Value Trap). The stock has 6 warning signs investors should review.

E10 is a concept invented by Prof. Robert Shiller, who uses E10 for his Shiller P/E calculation. E10 is the average of the inflation adjusted earnings of a company over the past 10 years.

Oi's adjusted earnings per share data for the three months ended in Jun. 2025 was R$-2.580. Add all the adjusted EPS for the past 10 years together and divide 10 will get our e10, which is R$1,863.56 for the trailing ten years ended in Jun. 2025.

During the past 12 months, Oi's average E10 Growth Rate was 105.60% per year. During the past 3 years, the average E10 Growth Rate was -29.70% per year. During the past 5 years, the average E10 Growth Rate was -36.80% per year. Please click Growth Rate Calculation Example (GuruFocus) to see how GuruFocus calculates Wal-Mart Stores Inc (WMT)'s revenue growth rate. You can apply the same method to get the E10 growth rate using E10 data.

During the past 13 years, the highest 3-Year average E10 Growth Rate of Oi was 9.70% per year. The lowest was -53.00% per year. And the median was -14.90% per year.

As of today (2026-06-29), Oi's current stock price is R$0.84. Oi's E10 for the quarter that ended in Jun. 2025 was R$1,863.56. Oi's Shiller PE Ratio of today is 0.00.

During the past 13 years, the highest Shiller PE Ratio of Oi was 0.88. The lowest was 0.01. And the median was 0.22.


Oi  (BSP:OIBR4) E10 Explanation

If a company grows much fast than inflation, E10 may underestimate the company's earnings power. Shiller PE Ratio can seem to be too high even the actual P/E is low.

For the Shiller P/E, the earnings of the past 10 years are inflation-adjusted and averaged. The result is used for P/E calculation. Since it looks at the average over the last 10 years, the Shiller P/E is also called PE10.

The Shiller P/E was first used by professor Robert Shiller to measure the valuation of the overall market. The same calculation is applied here to individual companies.

Oi's Shiller P/E Ratio of today is calculated as

Shiller PE Ratio=Share Price/E10
=0.84/1863.56
=0.00

* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD.
* For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.

During the past 13 years, the highest Shiller P/E Ratio of Oi was 0.88. The lowest was 0.01. And the median was 0.22.


Be Aware

Shiller PE Ratio works better for cyclical companies. It gives you a better idea on the company's real earnings power.


Oi E10 Related Terms


Oi E10 Historical Data

* Premium members only.

The historical data trend for Oi's E10 can be seen below:

* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD.
* For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.

Oi E10 Chart

Oi Annual Data
Trend Dec15 Dec16 Dec17 Dec18 Dec19 Dec20 Dec21 Dec22 Dec23 Dec24
E10
Get a 7-Day Free Trial Premium Member Only Premium Member Only 714.68 651.45 549.98 147.47 895.76

Oi Quarterly Data
Sep20 Dec20 Mar21 Jun21 Sep21 Dec21 Mar22 Jun22 Sep22 Dec22 Mar23 Jun23 Sep23 Dec23 Mar24 Jun24 Sep24 Dec24 Mar25 Jun25
E10 Get a 7-Day Free Trial Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only Premium Member Only 162.11 138.01 895.76 949.38 1,863.56

BSP:OIBR4 vs TMUS, VZ, T: E10 Comparison

For the Telecom Services subindustry, Oi's Shiller PE Ratio, along with its competitors' market caps and Shiller PE Ratio data, can be viewed below:

* Competitive companies are chosen from companies within the same industry, with headquarter located in same country, with closest market capitalization; x-axis shows the market cap, and y-axis shows the term value; the bigger the dot, the larger the market cap. Note that "N/A" values will not show up in the chart.


Oi Shiller PE Ratio vs Telecommunication Services Industry

For the Telecommunication Services industry and Communication Services sector, Oi's Shiller PE Ratio distribution charts can be found below:

* The bar in red indicates where Oi's Shiller PE Ratio falls into.


BSP:OIBR4
28GF Score
Oi SA BSP:OIBR4
E10 is just one metric. See GF Score™, valuation, warning signs, and more.
View Full Analysis

Oi E10 Calculation

E10 is a concept invented by Prof. Robert Shiller, who uses E10 for his Shiller P/E calculation. When we calculate the today's Shiller P/E ratio of a stock, we use today's price divided by E10.

What is E10? How do we calculate E10?

E10 is the average of the inflation adjusted earnings of a company over the past 10 years. Let's use an example to explain.

If we want to calculate the E10 of Wal-Mart (WMT) for Dec. 31, 2010, we need to have the inflation data and the earnings from 2001 through 2010.

We adjusted the earnings of 2001 earnings data with the total inflation from 2001 through 2010 to the equivalent earnings in 2010. If the total inflation from 2001 to 2010 is 40%, and Wal-Mart earned $1 a share in 2001, then the 2001's equivalent earnings in 2010 is $1.4 a share. If Wal-Mart earns $1 again in 2002, and the total inflation from 2002 through 2010 is 35%, then the equivalent 2002 earnings in 2010 is $1.35. So on and so forth, you get the equivalent earnings of past 10 years. Then you add them together and divided the sum by 10 to get E10.

Please note that we use the CPI data of the country/region where the company is headquartered. If the CPI data for that country/region is not available, then we will use the CPI data of the United States as default.

For example, Oi's adjusted earnings per share data for the three months ended in Jun. 2025 was:

Adj_EPS= Earnings per Share (Diluted) /CPI of Jun. 2025 (Change)*Current CPI (Jun. 2025)
=-2.58/169.6698*169.6698
=-2.580

Current CPI (Jun. 2025) = 169.6698.

Oi Quarterly Data

per share eps CPI Adj_EPS
201509 -103.519 101.392 -173.229
201512 -456.654 104.247 -743.239
201603 -403.792 106.979 -640.419
201606 -72.101 108.851 -112.387
201609 -132.904 109.986 -205.024
201612 -353.578 110.802 -541.430
201703 -7.542 111.869 -11.439
201706 -452.025 112.115 -684.077
201709 -2.122 112.777 -3.192
201712 -403.792 114.068 -600.619
201803 4,478.405 114.868 6,614.979
201806 -137.533 117.038 -199.382
201809 -57.466 117.881 -82.712
201812 -242.029 118.340 -347.008
201903 9.908 120.124 13.995
201906 -25.761 120.977 -36.130
201909 -96.107 121.292 -134.439
201912 -37.650 123.436 -51.752
202003 -105.025 124.092 -143.600
202006 -56.475 123.557 -77.552
202009 -43.595 125.095 -59.129
202012 29.724 129.012 39.091
202103 -51.521 131.660 -66.395
202106 17.834 133.871 22.603
202109 -81.245 137.913 -99.953
202112 -59.448 141.992 -71.036
202203 26.950 146.537 31.204
202206 -8.323 149.784 -9.428
202209 -53.998 147.800 -61.988
202212 -285.350 150.207 -322.324
202303 -21.104 153.352 -23.350
202306 -14.050 154.519 -15.428
202309 -4.750 155.464 -5.184
202312 -82.870 157.148 -89.473
202403 -46.780 159.372 -49.803
202406 252.810 161.052 266.339
202409 4.090 162.342 4.275
202412 -8.534 164.740 -8.789
202503 5.120 168.102 5.168
202506 -2.580 169.670 -2.580

Add all the adjusted EPS together and divide 10 will get our e10.

Frequently Asked Questions Learn more about E10 →
What does a E10 of R$1,863.56 mean?
Oi (BSP:OIBR4) has a E10 of R$1,863.56 as of Jun. 2025. E10 represents the company's inflation-adjusted earnings per share over a 10-year period. View historical data on Oi and its competitors.
Is Oi's E10 too high?
Oi's current E10 is R$1,863.56. Overall, Oi has a GF Score™ of 28/100 and is considered Possible Value Trap, reflecting its overall financial health beyond just this single metric.
How does Oi's E10 compare to TMUS and VZ?
Oi's E10 of R$1,863.56 can be compared against companies in the Telecommunication Services industry. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good E10 for a Telecommunication Services company?
A good E10 depends on the Telecommunication Services industry context. However, E10 should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high E10 mean?
A high E10 can signal that a stock is expensive relative to its fundamentals. E10 represents the company's inflation-adjusted earnings per share over a 10-year period. View historical data on Oi and its competitors. Oi's current E10 is R$1,863.56. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Oi stock overvalued right now?
Based on GuruFocus' analysis, Oi (BSP:OIBR4) is currently considered Possible Value Trap. The stock's GF Value™ is R$14.28, compared to a current price of R$0.84 — trading 94.1% below its estimated fair value. The current E10 is R$1,863.56. Oi's overall GF Score™ is 28/100 with 6 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is E10 calculated?
E10 is calculated from a company's financial statements. For Oi (BSP:OIBR4), the current E10 is R$1,863.56 as of Jun. 2025. GuruFocus calculates this using data sourced from SEC filings and annual reports. See the calculation section and 30-year financial data on this page for the full breakdown.

Is Oi (BSP:OIBR4) Overvalued in 2026?

Based on GuruFocus' analysis, Oi stock appears to be undervalued. The current stock price of R$0.84 is trading 94.1% below its estimated GF Value™ of R$14.28. GuruFocus considers Oi to be Possible Value Trap.

Key valuation signals for BSP:OIBR4:

  • E10: R$1,863.56
  • GF Value™: R$14.28 vs. price of R$0.84 (94.1% below fair value)
  • GF Score™: 28/100 with 6 warning signs

No single metric tells the full story. See the BSP:OIBR4 stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.


Oi Business Description

Address Rua do Lavradio, No. 71, 2nd Floor, Centro, Rio de Janeiro, RJ, BRA, 22280-004
Oi SA is a telecommunications company providing convergent broadband, pay TV, and local and long-distance voice transmission services. Currently, the group is focused on integrating telecommunications and Information and Communication Technology (ICT) services by offering a range of digital solutions related to cybersecurity, telecommunications, AI, cloud, and digital transformation for the corporate customer market. Additionally, the group is involved in providing BPO and field services, operating call centers, and offering a range of legacy services, which include services related to copper technology and regulated wholesale services. Geographically, the group operates in Bazil.
28GF Score

Get the complete analysis for BSP:OIBR4

E10 is just one metric. See GF Value™, 30-year financials, guru trades, warning signs, and more.

R$0.84
Price
R$14.28
GF Value